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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37e26171e0d135b3d076a7c9c272365d5b39f65f70d6fe16a1a324cf37e1291' 
  AND token = 'wtJAJy4t12tYWy7NWmPT19YVHY9CEYsajGWxbCq10rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}